<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      section {
        display: flex;
        width: 60%;
        height: 150px;
        background-color: red;
        margin: 0 auto;
      }

      section div:nth-child(1) {
        width: 100px;
        height: 150px;
        background-color: red;
      }

      section div:nth-child(2) {
        flex: 1;
        background-color: green;
      }

      section div:nth-child(3) {
        width: 100px;
        height: 150px;
        background-color: blue;
      }

      p {
        display: flex;
        width: 60%;
        height: 150px;
        background-color: red;
        margin: 100px auto;
      }

      p span {
        flex: 1;
      }

      p span:nth-child(2) {
        flex: 2;
        background-color: purple;
      }
    </style>
  </head>

  <body>
    <section>
      <div></div>
      <div></div>
      <div></div>
    </section>
    <p>
      <span>1</span>
      <span>2</span>
      <span>3</span>
    </p>
  </body>
</html>
